21026522 has 16 divisors (see below), whose sum is σ = 35247744. Its totient is φ = 9324000.

The previous prime is 21026519. The next prime is 21026549. The reversal of 21026522 is 22562012.

It is a super-2 number, since 2×21026522² = 884229254832968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21026494 and 21026503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10754 + ... + 12557.

It is an arithmetic number, because the mean of its divisors is an integer number (2202984).

Almost surely, 2^21026522 is an apocalyptic number.

21026522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21026522 is a deficient number, since it is larger than the sum of its proper divisors (14221222).

21026522 is a wasteful number, since it uses less digits than its factorization.

21026522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23365.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21026522 is about 4585.4685692958. The cubic root of 21026522 is about 276.0085151052.

Adding to 21026522 its reverse (22562012), we get a palindrome (43588534).

The spelling of 21026522 in words is "twenty-one million, twenty-six thousand, five hundred twenty-two".